Abstract
In the present work, the effects of 24-epibrassinolide (EBR) on the UV-Binduced changes in the pigment content of pea leaves were studied. Control (non-EBR-treated) and EBR-treated plants were irradiated with UV-B for 3 h and pigment analysis was performed after 24 and 48 h. The results show that EBR spraying of plants 48 h prior to UV-B exposure alleviates its detrimental effect on chlorophyll a and b (Chl a and Chl b) content in comparison with control pea leaves. An increase in carotenoids (Car) and UV-B absorbing compounds was also observed at low dose of UV-B radiation. For the first time, it is shown that UV-B damage effect on control leaves is accompanied by a significant (more than 50%) increase in their pheophytin a (Pheo a) content 48 h after the UV-B exposure and that the EBR pre-treatment prevents the increase of Pheo a content in UV-B irradiated leaves. In addition, it is demonstrated that EBR application modifies UV-B-induced alterations of energy distribution between the main pigment-protein complexes in pea thylakoid membranes.
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Claims 6
Claim · model-written summary
EBR spraying alleviated UV-B damage to chlorophyll a and b content relative to controls.
- Taxon
- pea
Lathyrus oleraceuse0 - Organ / stage
- leavese0
- Treatment
- EBR sprayinge0
- Outcome
- chlorophyll a and b (Chl a and Chl b) contente0
- Direction
- alleviatese0
- Qualifier
- 48 h prior to UV-B exposuree0
- Comparator
- control pea leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“EBR spraying of plants 48 h prior to UV-B exposure alleviates its detrimental effect on chlorophyll a and b (Chl a and Chl b) content in comparison with control pea leaves”
Claim · model-written summary
Carotenoids increased at a low UV-B dose.
- Taxon
- PeaLathyrus oleraceust0
- Treatment
- low dose of UV-B radiatione0
- Outcome
- carotenoids (Car)e0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An increase in carotenoids (Car) and UV-B absorbing compounds was also observed at low dose of UV-B radiation”
t0“Pea Leaves”
Claim · model-written summary
UV-B absorbing compounds increased at a low UV-B dose.
- Taxon
- PeaLathyrus oleraceust0
- Treatment
- low dose of UV-B radiatione0
- Outcome
- UV-B absorbing compoundse0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An increase in carotenoids (Car) and UV-B absorbing compounds was also observed at low dose of UV-B radiation”
t0“Pea Leaves”
Claim · model-written summary
UV-B exposure increased pheophytin a content in control leaves by more than 50% after 48 hours.
- Taxon
- PeaLathyrus oleraceust0
- Organ / stage
- leavese0
- Treatment
- UV-B exposuree0
- Outcome
- pheophytin a (Pheo a) contente0
- Direction
- increasee0
- Value
- more than 50%e0
- Qualifier
- 48 h after the UV-B exposuree0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“UV-B damage effect on control leaves is accompanied by a significant (more than 50%) increase in their pheophytin a (Pheo a) content 48 h after the UV-B exposure”
t0“Pea Leaves”
Claim · model-written summary
EBR pretreatment prevented the UV-B-induced increase in pheophytin a.
- Taxon
- PeaLathyrus oleraceust0
- Organ / stage
- leavese0
- Treatment
- EBR pre-treatmente0
- Outcome
- Pheo a contente0
- Direction
- prevents the increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the EBR pre-treatment prevents the increase of Pheo a content in UV-B irradiated leaves”
t0“Pea Leaves”
Claim · model-written summary
EBR application modified UV-B-induced energy distribution among pigment-protein complexes in pea thylakoid membranes.
- Taxon
- peaLathyrus oleraceuse0
- Organ / stage
- thylakoid membranese0
- Treatment
- EBR applicatione0
- Outcome
- energy distribution between the main pigment-protein complexese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“EBR application modifies UV-B-induced alterations of energy distribution between the main pigment-protein complexes in pea thylakoid membranes”
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See all 18 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.